Plantronics U10 Vista Base to QD Cable 26716-01Pack of 1Plantronics U10 cable. 3 metre headset amplifier cable used to connect some amplifiers to specific telephones. It has a clear RJ11 plug at one end with a quick disconnect at the other.

Jabra GN1200 Universal Coiled CablePack of 1Coiled universal telephone connection cable
Multiple switch settings enable compatibility with most phones
Incorporates an 8 position cabling changeover switch which enables the headset to be used with 90% of the telephones in use today